Bio:he strong and intelligent older sister of Jean Grey and daughter of Dr. John & Elaine Grey, Sara was a firm believer in the mutant cause. Though not a mutant herself, she supported her sister and the X-Men with all her heart, and was often ridiculed by others for it. When Jean left for the Xavier Institute, Sara made a promise with her that if Jean would use her powers to help save people, Sara would love her no matter what had happened. While she supported mutants, she often worried what would happen if her own children, Joey and Gailyn to her husband Paul Bailey, became mutants. After Jean's death, Sara often visited her grave, and remembered the times they had. One such adventure took place in Atlantis, where Attuma kidnapped the two sisters and planned on marrying them. They escaped, and as Sara came back to her senses, her apprehension over her children vanished and she knew if her children were anything like Jean was, she'd be very proud.

After Jean's resurrection, Sara went missing. While most of the X-Men thought it was mutant-hating groups, it was really the Phalanx that had absorbed her into its system. She was later found by Banshee, but it was too late to save her. Her death was mourned by Jean Grey and her family for years. Her children were eventually killed by the Shi'ar Death Commandos who wished to prevent any resurgence of the universe-threatening entity known as the Phoenix. It is unknown what happened to her husband, Paul Bailey.